"""k^aTisso!'™-}      The  Chemistry  of  Gurjun  Balsam.  1 53 
whether  any  difference,  other  than  the  above-mentioned,  could  be 
detected  between  the  two  specimens  by  means  of  the  reagents  I  had 
employed  in  the  quoted  work.  Last  year  Professor  Hamberg  presented 
a  sample  of  the  balsam  to  the  Museum  of  the  Pharmaceutical  Insti- 
tute of  this  town,  and  the  experiments  made  with  this  specimen, 
kindly  placed  at  my  disposal  by  Professor  Dragendorff,  and  a  sample 
of  gurjun  purchased  at  a  neighboring  chemist's,  yielded  the  following 
results : 
Both  samples  showed  a  strong  fluorescence  in  green,  and  formed  on 
standing  a  deposit  consisting  entirely  of  crystals,  the  quantity  of  which 
in  the  last  named  sample  was  small  in  comparison  to  that  received  from 
Professor  Hamberg. 
On  heating  in  a  test  tube,  the  balsam  from  Professor  Hamberg 
became  quite  solid,  so  that  the  tube  could  be  inverted  without  any  fear 
of  the  contents  running  out,  while  with  the  second  sample  a  solidifica- 
tion appeared  only  after  heating  for  a  considerable  length  of  time,  and 
even  then  it  did  not  become  so  thick  as  the  first  named  sample. 
Alcohol  (95  per  cent.)  dissolved  both  samples  with  the  exception  of  a 
white  residue. 
Ether  impure)  dissolved  also  incompletely.  The  cloudy  mixture 
became  on  the  addition  of  an  equal  volume  of  alcohol  nearly  clear, 
and  the  greater  part  of  the  deposit  was  taken  into  solution. 
Ether  and  Alcohol  (equal  volumes)  gave  an  opalescent  solution. 
Chloroform  dissolved,  forming  a  clear  liquid. 
Solution  of  Bromine  (i  part. of  bromine  in  20  parts  of  chloroform) 
added  to  the  chloroformic  solution  of  the  balsam  (3  drops  balsam,  i  cc. 
chloroform  and  5  drops  bromine  solution)  produced  at  first  no  appreci- 
able alteration,  but  after  a  time  the  mixture  became  intensely  green- 
colored  and  retained  this  color  tolerably  long. 
Bisulphide  of  Carbon  gave  a  cloudy  solution  with  the  balsam  and  the 
reagent  recommended  by  Fliickiger  produced  a  deep  violet  colora- 
tion, which  in  Hamberg's  sample  was  permanent  for  hours,  whilst 
in  the  second  sample  it  disappeared  in  the  course  of  a  short  time. 
Alcoholic  Solution  of  Acetate  of  Lead  (a  saturated  solution  of  acetate  of 
lead  in  95  per  cent,  alcohol)  produced  in  the  filtered  alcoholic  solution 
no  change. 
Alcoholic  Solution  of  Ferric  Chloride  (10  per  cent,  in  95  per  cent,  alco- 
hol) colored  the  alcoholic  solutions  of  the  balsam  darker. 
